Rock River impressions
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RE: Rock River impressions - 4/14/2008 6:56:36 PM
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ScottyPotty
Posts: 65
Joined: 4/12/2008
From: Ohio
Status: offline
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Im just currious - what bullets are you using? what is the twist rate?
What distance are you shooting? 3/8" @ 100 is pretty good
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RE: Rock River impressions - 4/15/2008 5:29:52 AM
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billnourse
Posts: 5556
Joined: 12/22/2004
From: Bloomfield, NM
Status: offline
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With the best groups I was shooting a 69 grn Sierra HPBT in front of 25.5 grns. of H335. The group with this load was .656" for 5 shots at 100 yards. I had four shots that measured .352" with the one flyer that opened it up to the .656.
With a 55 grn. Nosler Ballistic Tip in front of 26.0 grns of H335 I had a group that went .904". and with the same bullet and 23 grns of H335 I had a 5 shot group that was just under an inch with four of the shots going .325".
With the 45 grn Hornady .22 Hornet bullet the best I could do was 4 shots right an 1 " with a flyer that opened it up to 1 1/4". I don't know if the twist rate is getting me with this light of a bullet or if it's just that the Hornet bullets don'tshoot well in this gun. I am going to try some 40 grn V-max or 40 grn Sierras and see what happens.
The bbl is a 20" NM Wilson stainless steel air gauge with a 1 in 8 twist. Trigger is RRA's NM.
BIll
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RE: Rock River impressions - 4/15/2008 7:17:56 PM
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ScottyPotty
Posts: 65
Joined: 4/12/2008
From: Ohio
Status: offline
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Yeah the 1:8 twist is a little fast for 40gr bullets, its pushing it a bit, but who knows they may work for you.
Ive been using H335 for a general purpose round with (pulled) 62grn M855 bullets with 25gr H335. I havent really tested to much for accuracy - I was going for battle field accuracy.
For the varmints I was using a 26.8gr varget with the 60gr Vmax. It was a 1-9 twist barrel with 3 shot groups around .375 - that barrel also liked 68gr Hornady HPBT bullets, which group all day at .750 - I was just getting into more trials with the 60gr Vmax when I sold the upper.
I just picked up a 18" (SPR) white oaks armament match barrel with the wylde chamber. It has 1:7 twist but I havet started loading for it yet, but Ill probably have to stick to the longer heaver bullets. I would probably prefer a 1:8 twist to shoot the 55gr bullets better. Im not sure how low I will be able to go.
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