2450 +/- 20 fps, best guesstimateI have worked up a good load with the 77 smk and 23.5 Varget. All groups together average.51 moa. Its going to be awhile before I can get back to the range to chrono. Any guess what FPS I should be getting?
BCM SS 18” barrel 1/8 twist
He might be more concerned with listening to the gun through careful workup, and judging the load on how it shoots rather than how fast it flies.Any reason you are doing your so-called load development without a chronograph?
You can probably push a little more, but watch it carefully. 24.0 in Varget can get a little spikey, I think. RE15 is about 1/4 to 1/2 a grain more before it does the same.Thanks, I was hopping to be closer to 2600. It sure shoots good.
As always, even if it isn't a speed you like as well as if it were faster, go with the one that shoots best. A 1/2 minute gun is worth quite a bit of windage. And confidence.Remington brass, 7.5 BR primers. I worked up to 24 grns Varget. All groups were sub moa but the 23.5 was clearly the best grps.
In the Sierra manual under AR-15 the listed max for Varget is 24 grains, which are typically conservative when it comes to pressure. The issue with 556 is case capacity and compressed loads, especially when trying to keep an overall length of 2.260 for feeding reliability.I run 24.5gr of Varget with 77gr SMK and 205 Match AR primers and velocity is 2768fps. That is coming out of an 18-inch barrel.
I think you’re assuming a lot here. I’m certainly not doubting your experience, lots of very knowledgeable people on here and what you’re saying makes total sense. However to pooh-pooh someone’s load that’s a 1/2 grain over max is silly. I did my due diligence and it has been completely safe in my rifle for years. That load is an accuracy load for long distance, I dont burn it down. Just providing a velocity data point for the OP.@Billiam1211 that’s fine. I’m not telling you how to live your life. You don’t have to justify shit to me.
I’m stating, for the record, that that is not how I live mine.
I’ve seen too much shit break in ARs from guys trying to make them boltguns for me to recommend heavy loads on the open internet. A little too much sunlight on a magazine full of those, and you might be picking anvils out of your trigger group. Seen it. A LOT. Cloned Mk262...had to cut 0.010” off the bullets to make the powder fit. I get it.
I just don’t, because I’ve maybe FINALLY learned for myself what it should NOT be asked to do.
It’s one of those “stupid games, stupid prizes” things, where if you push the limits day in and day out, sooner or later, you won’t have the right stuff.