Quoted:
Hi,
I have found in my rifle (which is a Larue Stealth 18", .223 wylde, 1 in 8 twist), that it enjoys 24.5 gr. of Varget using 69 gr. SMK BTHP at 2.26" in LC brass and remington 7 1/2 primer. I average 2604 fps and get under 1 moa at 300yards.
I am trying the 77gr. SMK BTHP with 23.9 gr. Varget and OAL at 2.26" but I am hearing some crunching when seating the bullet with my Redding Competition seating die. I chronographed this at 2595 fps average.
With 24.3 grains of Varget it is obvious that crunching/compression is occurring but there are no pressure signs and get 2641 fps average. But I noticed that the redding competition die is seating a bit longer in the compressed loads. Is this normal? Should I stop at 23.9 grains of Varget when I started hearing compression?
I have read internet posts of people seating at 2.260" and under using 24.5 grains of Varget and even more, but I have a hard time believing it because you can't seat the 77 grain SMK without compression at those numbers.
iAlso does seating with compressed loads hurt the redding die? Have any of you experienced the redding die seating longer as loads are compressed?
I have also noticed as you increase your charge weight into compression, it takes additional turns of the seating die to achieve the same OAL.
If you feel like experimenting, try IMR8208XBR with that bullet (ETA: 77SMK) . I get 2650fps (24.1g) from a Stealth 16" barrel, and under MOA.
And, I agree that the crunching is not an issue. I've crunched the heck outta some Varget.