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Marshall & Roger,
I have the exact same problem with the 330 gr bullet with 56.0 gr of H-335 or 50.0 gr H-322. Near as I can tell, the back pressure of the compressed powder simply exceeds the bullets ability to hold its place in the case. At first I was having to keep reseating the bullet until the loa was right. That meant measuring the loa every time the cartridge came out of the seating die, before going into the factory crimp die.
Part of the problem is that I seat the bullet shorter than Marshall calls for in his Part III 444 Marlin article. I seat to (330gr LFNDCGC in .432) the cartridge to 2.570 which give me about 1/16" engagement to the lands. I notice Roger is going even shorter with loa. I imagine that seating the bullet with a light crimp might hold the bullet still till it it put through the factory crimp die.
My cure for the problem has taken 2 directions. First is that before seating the bullet, I tap the case (with the powder charge in it) lightly on the table about 30 times. That settles the powder some and makes for less compression. The other thing I did was drop down 2 grains in both the H-335 and H-322 loads. It cost me a grand total of 70 fps and is noticeably easier on the shoulder (porting timing). There was a nice drop in pressure too. I have ultimately settled on 48.0 gr of H-322 (Marshall suggested I try this powder) for 2010 fps out of my Outfitter.
I use Redding dies with a flat seating stem, Rem brass, WW primers.
Marshall, maybe you have a shortcut that will make all this easier without having to change or drop powder charges.
God bless............... Bill M
I have the exact same problem with the 330 gr bullet with 56.0 gr of H-335 or 50.0 gr H-322. Near as I can tell, the back pressure of the compressed powder simply exceeds the bullets ability to hold its place in the case. At first I was having to keep reseating the bullet until the loa was right. That meant measuring the loa every time the cartridge came out of the seating die, before going into the factory crimp die.
Part of the problem is that I seat the bullet shorter than Marshall calls for in his Part III 444 Marlin article. I seat to (330gr LFNDCGC in .432) the cartridge to 2.570 which give me about 1/16" engagement to the lands. I notice Roger is going even shorter with loa. I imagine that seating the bullet with a light crimp might hold the bullet still till it it put through the factory crimp die.
My cure for the problem has taken 2 directions. First is that before seating the bullet, I tap the case (with the powder charge in it) lightly on the table about 30 times. That settles the powder some and makes for less compression. The other thing I did was drop down 2 grains in both the H-335 and H-322 loads. It cost me a grand total of 70 fps and is noticeably easier on the shoulder (porting timing). There was a nice drop in pressure too. I have ultimately settled on 48.0 gr of H-322 (Marshall suggested I try this powder) for 2010 fps out of my Outfitter.
I use Redding dies with a flat seating stem, Rem brass, WW primers.
Marshall, maybe you have a shortcut that will make all this easier without having to change or drop powder charges.
God bless............... Bill M
