Weatherby 338 RPM

I would have NO problem having a 6.5-284 Norma - 284 Win or a 6.5 RPM built on a Kimber 84 M or 84L action and SHOOT it too ! jmo RJ


I was wanting a lightweight sheep hunting rifle and thought 6.5 Creedmoor but gunsmith says nope lets do a 6.5-284 Norma on a Kimber Montana 84M action, Ill open up the mag box for factory ammo as thats what I normally shoot, so here we are and so far Im extremely happy with the outcome and as usual the workmanship was first class.

Kimber Montana 84M Action Trued, Squared & Slabbed and an alloy bolt knob, lightweight trigger guard
Factory trigger set at 2.5 lbs
22" SS Benchmark 1-8 twist, 5R, #1 contour barrel, custom built muzzle brake, holes angled forward on 3 sides but not on the bottom, barrel 24" with brake

Nosler 130 Acubonds at 3000 Plus FPS 22 " Barrel !
Nosler 140 Acubonds at 2900 plus FPS

Has NOT BLOWN UP !
 
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I was wanting a Weatherby Backcountry Ti 6.5 RPM, I got impatient waiting so had my gunsmith build one on a Kimber Montana 84L donor,
My Gunsmith lengthened the mag box so we can load those 156 Bergers without issue, added an Alloy trigger guard, trigger set at 2.5lbs, 24 inch SS #2 contour 1-8 twist Benchmark Barrel, Black Gunkote on all metal surfaces, MGS used a yellow green for the stock with some multi coloured splatter, I opted for no brake so we will see how snappy this rig is as its not very heavy, 7lbs 3oz scoped with a Zeiss V4 4-16x44

Range Day #1 on the 6.5 RPM, I had a box of each of the factory ammo, these speeds out of a new 24" Benchmark Barrel, recoil was firm and straight back no terrible muzzle jump so was manageable, all shots at 100 yards.

140gr Interlocks advertised velocity 2975fps- actual 3030/3022 first two shots to zero, cleaned barrel then 3 more shots at 100 3002/2993/2982 producing 1.1" group.

140gr Accubonds advertised velocity 3075fps- actual from a clean barrel 3041/3013/3014, produced a .9" group

127gr LRX advertised velocity 3225fps- actual from a clean barrel 3103/3109/3093 produced a .6" group

Range Day #2 with the 6.5 RPM, I took a stab at where to start with R26 63.0/63.5/64.0/64.5/65.0grs, this started last time out at the range where my LabRadar was acting up so never got a velocity reading for 63.0/63.5 (3/4" groups), so stopped there and ordered a new LabRadar, so today was bit better.

6.5 RPM, R26, BR2 Primers, once fired Factory Wby (Hornady Brass) Berger 156gr Elite Hunters, COAL 3.410"

Clean barrel 64.0grs- 3045/3029/3035

I adjusted the scope and then shot the 65.0gr group, 3061/3072/3070

I ran a string up from my load of 65.0grs of R26/BR2 Primers, New Wby brass and 156gr Berger Elite Hunters

65.0-3068
65.3-3089
65.6-3108
65.9-3126
66.2-3145-slight tight bolt lift
66.5-3148-slight tight bolt lift and light ejector marks, I stopped there.

Has NOT BLOWN UP !
 
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remington jim said:
I was wanting a Weatherby Backcountry Ti 6.5 RPM, I got impatient waiting so had my gunsmith build one on a Kimber Montana 84L donor,
My Gunsmith lengthened the mag box so we can load those 156 Bergers without issue, added an Alloy trigger guard, trigger set at 2.5lbs, 24 inch SS #2 contour 1-8 twist Benchmark Barrel, Black Gunkote on all metal surfaces, Gary used a yellow green for the stock with some multi coloured splatter, I opted for no brake so we will see how snappy this rig is as its not very heavy, 7lbs 3oz scoped with a Zeiss V4 4-16x44

Range Day #1 on the 6.5 RPM, I had a box of each of the factory ammo, these speeds out of a new 24" Benchmark Barrel, recoil was firm and straight back no terrible muzzle jump so was manageable, all shots at 100 yards.

140gr Interlocks advertised velocity 2975fps- actual 3030/3022 first two shots to zero, cleaned barrel then 3 more shots at 100 3002/2993/2982 producing 1.1" group.

140gr Accubonds advertised velocity 3075fps- actual from a clean barrel 3041/3013/3014, produced a .9" group

127gr LRX advertised velocity 3225fps- actual from a clean barrel 3103/3109/3093 produced a .6" group

Range Day #2 with the 6.5 RPM, I took a stab at where to start with R26 63.0/63.5/64.0/64.5/65.0grs, this started last time out at the range where my LabRadar was acting up so never got a velocity reading for 63.0/63.5 (3/4" groups), so stopped there and ordered a new LabRadar, so today was bit better.

6.5 RPM, R26, BR2 Primers, once fired Factory Wby (Hornady Brass) Berger 156gr Elite Hunters, COAL 3.410"

Clean barrel 64.0grs- 3045/3029/3035

I adjusted the scope and then shot the 65.0gr group, 3061/3072/3070

I ran a string up from my load of 65.0grs of R26/BR2 Primers, New Wby brass and 156gr Berger Elite Hunters

65.0-3068
65.3-3089
65.6-3108
65.9-3126
66.2-3145-slight tight bolt lift
66.5-3148-slight tight bolt lift and light ejector marks, I stopped there.

Has NOT BLOWN UP !
Click to expand...

140s at 3000 and 130s at 3100.

That’s a lot of d*cking around to get a 270 Winchester!
 
3100 fps with 156 gr bullets out of a .264 bore isn't bad imo. RJ is that from a 24" barrel. I've noticed a lot of 280 AI info is from a 26" barrel. A 264 winchester mag won't be much faster if at all. Neck that case up to 7mm and I bet it will match the 7mm remington.
 
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