Home Forums Reloading Big Game Rifles 6mm Rem, 100 grain speer and imr 4350

To quote from Speer: The Speer 110-grain boat tail bullet featured in the past had a long bearing surface that caused it to produce higher pressures than the 100-grain Grand Slam and 105-grain Hot Core. Older manuals had a separatedata chart for the boat tail as a result. Several years ago we changed the profile of the bullet to give a longer ogive and shorter bearing surface. This change means current 100-grain bullets can use the Grand Slam and Hot-Core data. You have bullets of the older style if the last character in the lot number is "F" or lower(silver, black and red banded labels), or if in the older style largely yellow labels. If you have the older style, do not exceed the 105-grain start loads. These loads do not exceed 52,000 CUP industry limit for this cartridge. They also sent me the entire load data from there manual I can share. For the 100 and 105 grain the spread is from 39 to 43 grains of IMR4350. ALPINECRICK - RL22 max is listed at 47.0, in case you are wondering.

38.3 to 43.5 From Lee manual 2nd edition.

I'm getting around 3,200fps in a 26 inch barrel. With the 95grain Sierra Matchking I am hitting 3,345fps through the chrony but using 48 grains of RL22. This is my goto powder for the 6mm in the heavier weight bullets.

For what it's worth, using 49 grains of H4813sc with the matchkings averaged 3,240fps and reasonable accuracy.

I also think this is a cartridge that really benefits from a longer barrel. The gains from what I have seen tend to be sound going from 22 inches to 26 inches. However the compromise is always a less handy rifle...if that is a concern.

I have used 42.5 gr. of IMR-4350 with a 100 gr. Remington PSPCL in a Remington 788. It shot well.

If you're dissatisfied with the velocity you're getting with the Speer 100 BTSP, pick up a can of IMR4831 for 3000 fps and fine accuracy. I load 45/imr4831/100 Speer btsp for 3034 fps from a 20" barrel. Bob Hagel liked 47/imr4831 for 3120fps. Ken Waters used 45 gr of the same powder for 3142 fps with the Hornady 100 gr bullet. Of course, YMMV.