I have a marlin 1895m in .450 marlin dialed dead on @100 yards useing 350 grain fp hornady rounds.I was wondering what the max.effective range of this combination is.I also have been useing a 1.75 to 4 power scope on the rifle and was wondering if someone could point me in the right direction of a caliber specific bdc reticle scope with greater magnification.Any feedback would be greatly appreciated as hunting season is just around the corner.

I'm not sure if you were/are asking for the MPBR with the 350gr load or the max effective range for that cartridge. If you were asking for a max range not needing to adjust your aim point and be effective on deer-sized game(MPBR), you can figure about 150yds for the 350grFN and if you switch to the 325gr LE load about 200yds for it. I'd simply sight either one in at 1.5"-2" high at 100yds and you will still be within the kill zone at those ranges.

If you did indeed mean the max range at which you could expect to cleanly kill deer-sized game, that would be about 350-400yds for either load (at least). Of course, the trajectory is difficult to master at such range with a total drop of about 3 feet for the 350 and about a foot less for the 325 at 300 yds, when sighted as above. If you choose the 150 or 200 yd figures mentioned above as maxes, then in my opinion no additional magnification would be needed for deer-sized game at those ranges.

Those trajectory figures sound about right. FYI, just about any decent load manual has tables in the back. If you don't have an exact B.C. for the bullet, figure blunt bullets maybe around .2 and pointy ones at least .3 It really won't matter much if you are off a bit, for normal hunting. Muzzle velocities can be taken from a loading manual or the manufacturer's web site. Being off 100fps plus or minus won't really matter either. If you don't have a load manual then there are trajectory calculators online. All you need are a velocity, and a ballistic coefficient (B.C.) for the bullet. Plug in your 100 yard zero and off you go.

Sighting in 2" high at 100 will make most lever guns shoot flatter than people would suspect, even with pistol cartridges. I'm sure your .450 will serve you well

Good luck.

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MikeG