that 43 gr load is kinda on the hot end for 4759 for my taste, some people shoot more but it can be punishing on the recoil end. Originally when the Ball guys were developing the Savage they shot 35 to 40 gr. of 4759 and that was plenty. Personally I have 2 MLIIs in 50 cal. and get good accuracy after a bit of tweaking. They are pretty much factory but I polished (JB) the bores and bedded the actions and floated the barrel. I use a folding loading rod in the field, no ramrod on a hanger for me, and a range rod at the range and for cleaning. I have found that .458 bullets in 300 or 325 grains weight in the orange or black crush rib sabot shoot best. Of the many 300 bullets available the accuracy seems pretty much interchangeable but the Barnes original and Speer give superior terminal performance. The Hornady 300 with it's deep hollowpoint has been somewhat fragile for my taste on terminal game performance but I'm pushing it at 21-22C and at close range it will frag. One of my barrels is SS and the other is CM-blue. the blue barrel likes the orange sabot with the 300 grain .458 bullets and the SS likes the BCR with the .458s. I have been shooting 4759 but it is hard/impossible find as no longer made. this season will be moving on to H or IMR4198 and have found source of Alliant Reloder 7. If you shoot faster powders like the 4759 and/or hot slower powder your vent can erode faster so get some hard ones and keep check on the size. Personally I like the Lehigh vent liners as they seem to be harder and will last a couple of seasons, 200+-shots, for me. You didn't say if your stock is lam or "Tupperware" but bedding and taking the flex out of the stock will help. I bed a section of graphite fishing rod in the ramrod channel on my guns to stiffen the forearm when I do the bedding job and it takes the flex out.
SO I will say to:
1. polish the bore
2. do a bedding job, hillbill has good process over on Dougs.
3. try .458 cal bullets in the 300 grain or the 325 FTX size
4. don't have the rod on the gun when shooting
5. cold barrel/heat is the enemy of sabots/summer shooting is not so good try for the cool of early morning and wait at least 15 minutes between shots or get a cool rod from rossman40 over on Dougs.
6. Safety is very important!! mark your loading rod/range rod anddo not be distracted when shooting/loading at the range.
Hope you find the SML to your likeing. I'm an addict! W
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