07-04-2020, 01:10 PM
windsage Wrote:I got decent results with the 75gr ELD's using CFE223 up to 3,050 fps, but the best loads were all running right around 2,900 fps. I have the a set of 30 rounds made up with the 95 gr SMK with the same CFE223, and I hope to get back out this weekend to see how they perform. I noticed when Hornady made their new 6mm ARC they shortened the case by .080, and I'm beginning to think they might be on to something. All of my best loads are at about 85% fill, and as the bullets get heaver, the fill is going down. It seems I won't get enough barrel time (or pressure) to push up to slower powders like RL16 and keep burnout before the barrel exit. I am having some fun though, and the feeding has been flawless. This makes a really nice varmint rifle, and it seems like it will be ok a bit past 1,000 yds.
Not sure in your chamber and barrel length, but in my IMP chamber R16 works well with the 88's. H4350is another one that might work for you ...about the same as R16 but have heard from others it does not take up as much volume.
Pretty sure Hornady shortened the ARC so they could load the 108 gr bullets at mag length...kinda like the 450 Bushmaster, so it would work with the 250 FTX .....
I was curious to see how much velocity I would lose in 22" vs 27" shot some 88's loaded with 8208 ...27 is just shy of 2900 fps and 22 is just shy of 2800 which is same loss I saw with 53 gr bullets loaded with 8208 as well. IMP case can shoot 1 gr more 8208 than other data I saw other guys with normal 22 Grendel chambers.
There is a 224 Grendel FB page with lots of info on 22 Grendel. The moderator has done several QL workup with the heavier bullets/different barrel lengths.