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  #1  
Old 09-01-2010, 03:14 AM
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243Win-IMR 4350


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243 Win, 100 grain Grand Slams. Trying to work up a new load. My old Speer manuel says a max load of 38 grains at 2.580. My newer manuel says 41.5 grains at 2.630. Made an oops and loaded five at 40 grains and 2.580. Should I throw them away, or can I try them? How critical is OAL when approaching max loads? These will be shot in a Rossi single shot, one of the Trifecta barrels, 16 inch I think. Any guesses to velocity? Also shooting 100 grain BTSP, started at 35 gr, working up to 38. Their is a note in the newer manuel about the old style Speer BTSP bullet, guess it has a longer bearing surface than other Speer 100 grain bullets. I appreciate the help fellas.
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  #2  
Old 09-01-2010, 06:01 AM
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The latest Sierra manual says 41.7 gr of IMR-4350 for their 100 gr bullets. At 40 gr the velocity is listed at 2800 fps. My best load for accuracy in a Rem 760 was 39 gr with no signs of excessive pressure. I'm about to run a test on a new rifle from 38 gr to 41 gr, starting at the bottom of course.
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  #3  
Old 09-01-2010, 07:19 AM
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QuickLoad suggests your 40 grain charge of IMR-4350 under a 100gr Speer GS bullet, seated to 2.580", should generate ~50,000psi. The 243 Win is designed to handle up to 60,000psi, so you should be in good shape and can even work up to 41.7 grains, as they suggested. I would probably play with the OAL to see if seating them out deeper gives you better accuracy.

Let us know how they group.
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  #4  
Old 09-01-2010, 08:36 PM
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No, don't throw them out. You loaded them to the shorter length, which is OK; they just have more jump to the lands, and you're still below the newer book max charge. My Speer #12 manual lists 38.0 gr as max charge for IMR 4350 with the 100 gr GS. I'm guessing you'll be in the 2500 fps arena.
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  #5  
Old 09-02-2010, 12:55 PM
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Thanks fellas, I felt like theyd be ok, but was not sure how critical OAL was. Seemed like the deeper a bullet is seated, the higher the pressure could be. Ill let you know what kind of accuracy they give me.
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Old 09-05-2010, 04:51 PM
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Originally Posted by Farrier Matt View Post
Thanks fellas, I felt like theyd be ok, but was not sure how critical OAL was. Seemed like the deeper a bullet is seated, the higher the pressure could be. Ill let you know what kind of accuracy they give me.
you are correct in that deeper seating will increase pressure but you are below max enough and not seated deep enough to worry

In my win mod 7o .243 started by pushing bullet into case just far enough to keep it from falling out inserted cartridge closed bolt,I then mic'd and seated .010 deeper.got fantastic accuracy 41.5 grn w/87 grn v-max

I don't care what they say about fancy new powders IMR-4350 is the berrys in an extremly wide array of cartridges and is fairly forgiving to small errors
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  #7  
Old 09-07-2010, 05:58 AM
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Seems I recall hearing about IMR-4350 loads in .243 having some issues with secondary pressure spikes so have avoided that powder.

Is my memory failing me or is it a fact?
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  #8  
Old 09-08-2010, 04:00 AM
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When at max charge, is thier a rule of thumb as to how short is too short? Or short enought to cause pressure problems? Im sure it varies a lot, I probably just need more time at the loading and shooting bench.
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Old 09-09-2010, 07:10 AM
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In my bench rest days we always seated the bullets to engrave rifling and then proceeded to develope our loads.

When loading for the .243 two powders that excelled in my expierience were H380 and H414 many more used IMR4350 and H4831 most of them asked me what I was loading.
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  #10  
Old 09-14-2010, 10:23 AM
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Quote:
Originally Posted by tuckerdog View Post
you are correct in that deeper seating will increase pressure but you are below max enough and not seated deep enough to worry

In my win mod 7o .243 started by pushing bullet into case just far enough to keep it from falling out inserted cartridge closed bolt,I then mic'd and seated .010 deeper.got fantastic accuracy 41.5 grn w/87 grn v-max

I don't care what they say about fancy new powders IMR-4350 is the berrys in an extremly wide array of cartridges and is fairly forgiving to small errors
There is no significant difference in pressure with a change in COAL in the .243, unless you make it too long and engrave the lands. In that case pressure could spike unless you have worked up your loads for that condition.
The concern about deep seating and pressure comes from straight wall cases, such as .45-70, and most pistol cases. A slight change in seating depth will significantly change the volume and the pressure. A small bullet in a large volume case (such as a .243) will have very minor changes in volume with a change in seating depth.
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  #11  
Old 09-21-2010, 12:43 PM
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Thought I would give everyone an update.
Rossi single shot 243 with a 16 inch barrel.
1.5-4.5 powered Swift scope
100 gr Speer Grand Slam
40 gr of IMR 4350
OAL 2.580
1.5 inch 100 yard groups

This is the lightest rifle Ive ever shot, and am really looking forward to hunting with it this fall. Gonna play with OAL next time at the range. Think I may bump up another grain as well, to 41. Max listed is 41.5. Anyone got a guess on MV? I have never loaded rifel cartridges before, only handguns, so its been a good learning curve for me. Thanks for all the help so far.
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Old 09-21-2010, 01:31 PM
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Roughly 2500fps, with pretty tremendous muzzle blast, for such a mild-kicking round. You might consider a faster-burning powder, if you find your gun is belching flames for several feet. Should be a very fun gun to shoot and I hope you bag something memorable with it. Better ballistic efficiency (and 150fps more velocity) would be attained with a faster-burning powder. You might try 36gr of IMR-4895 or 35gr of IMR-3031.
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  #13  
Old 09-21-2010, 03:51 PM
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Thanks for the advice, I have some 4895 on hand. I like the extra 150 fps. Ill give it a try.
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Old 09-21-2010, 07:36 PM
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I've been been playing with some H414 pushing Sierra 85gr BHTP's .015" off the lands and BR2 primers in a 243, Tikka T3 Lite. 45.3gr's are giving consistant 1 1/2" and some smaller three shot groups at 400yds. Muzzle velocities are running 3438 to 3468. This is right on the edge of absolute max pressure. The cases still mic good after several firings of this load but the primers are getting hammered pretty hard and it has pushed one primer out on the six load of that case. If I back down to 45gr's the groups open up to about two inches and at 44.7 they are close to three inches.

I've also been working some Reloader 17 with 129gr Hornady's in a custom 260 and it luvs the stuff. I'm going to try some of that in the 243 next.

My 6mm Rem shoots one big hole with IMR4350 but the 243 nor the 260 have shot as well with the IMR4350 or the H4350 as the 6mm does. I'm also pushing the 85gr BTHP's in it at approx 3,450fps and have been shooting that same load since 1970.
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  #15  
Old 09-22-2010, 06:04 AM
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I just acquired a Ruger M77 Tactical in 243. An old box of handloads was marked with best load using Sierra 100gr SPFB and 39gr of IMR-4350. I ran a series last week after shooting 35 rounds the week before. The last test was aggravated by the fact that the scope rings loosened on the receiver. However, the best five shot group was 0.29" vertical using 38gr of IMR-4350. The horizontal spread was about an inch but the rear rest was allowing the gun to wiggle sideways. This was at 100yd. I'll try another test in a few weeks with a better rear rest and load the range of 37gr to 41gr. I still suspect that 38-39 will be the best. At 41 there were no signs of excessive pressure. The jump was about 0.030" short of COL.
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  #16  
Old 09-22-2010, 09:41 AM
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Those are some great groups guys. I hear you all talking about seating the bullet off the lands, but with my single shot I cant get the bullet out far enough to touch them. I set a bullet at 2.950" and didnt touch the lands. I guess mine has a longer throat huh? I know its not the best group, but Im happy with my 1.5s out of this rig, although I did think about mounting a higher power optic, just to see how well this little gun would shoot with some better glass.
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  #17  
Old 09-22-2010, 11:31 AM
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I wouldn't worry about bullets being seated close to the lands. Thought it was a big issue, too, till I got a rifle that had a LOT of freebore but still shot well. My Weatherby falls into this category also, and maybe I have another but will have to think which one it is.

Anyway, seat the bullets straight in the cases. Priority 1, it's all for naught if you have crooked bullets (my opinion). Work up a load with the bullets seated straight and see which powder charges work best. If that still didn't work I'd switch bullets before I fiddled endlessly with seating depth or even changed powders.

Good luck.
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Old 09-22-2010, 07:36 PM
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A few years ago I tried my first collet neck sizing die. Now I've gone to them with everything thing I load, and that's a bunch. About that time I also started cleaning the inside of the necks with stainless brushes mounted in a cordless drill. Those two changes made a world of differences in accuracy. The bullets consistantly slide in nice and smooth, and straight with very little pressure. Since I don't shoot bench rest, I don't trim necks, but I do debur the inside of the flash hole and I do my primer pockets so I get a consistant seat without having to apply large amounts of pressure.

I also weigh every powder load. I set my dumper so it's about 1/10 grain shy and trickle the last few granuals. By paying attention to a few simple details, I consistantly shoot 50 round batches that have less than a 20fps spread between high and low velocities. Which I feel is pretty good for sporting/hunting rifles and hunting loads.

Last edited by BKeith; 09-22-2010 at 07:38 PM.
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  #19  
Old 09-23-2010, 11:30 AM
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Can't say much I've been working out a load for my .243
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  #20  
Old 09-23-2010, 05:11 PM
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That's just terrible! You need to pitch that rifle in the lake......
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