The difference a barrel can make...

[Ridgerunner665]

Exact same load...same powder lot, same brass lot, same bullet lot, same primer lot...loaded during the same loading session (scale calibration)...every charge trickled in by hand.

130 grain BT
Win brass
54 grains H4350
CCI BR2 primer
3.34" OAL

Remington 700 ADL, 22" barrel....the load appeared to be pushing the limits of pressure in the Remington, light ejector marks and some primer flattening...2,850 fps.

Winchester Featherweight Deluxe, 22" barrel....no signs of pressure at all, primer cups still nice and round at the edges....3,030 fps.

 

[SJB358]

I doubt there is pressure at 2850 on the Remington RR. What I would bet more than likely is the firing pin on the Remington is a little undersized for the hole and the headspace for the case in the rifle is a little loose making it look like PSI issues. Again, just a guess, but if your only getting 2850 with the same load, it's telling me the Remington has a larger chamber than your Winchester (great news for the Winchester).

I don't wholly believe in fast or slow barrels. I think if you could slug them both and see one is different than another then maybe that would explain it some. Wouldn't take much size difference in the bores to change them. It is an interesting topic for sure though. Just goes to show how different two same chambered rifles can act. Very cool. Thanks for posting this.

 

[DrMike]

It would be interesting to measure case capacity from the two chambers.

 

[gerry]

And the exact size of the bore would be interesting to compare. Sounds like the new gun is doing well.....

 

[Ridgerunner665]

It would be interesting to measure case capacity from the two chambers.

I can do that...

 

[Ridgerunner665]

And the exact size of the bore would be interesting to compare. Sounds like the new gun is doing well.....

The wife's new rifle is finally all put together...gonna shoot for groups tomorrow.

 

[SJB358]

That's beautiful RR. Very well set up. Great cartridge too

 

[Ridgerunner665]

I doubt there is pressure at 2850 on the Remington RR. What I would bet more than likely is the firing pin on the Remington is a little undersized for the hole and the headspace for the case in the rifle is a little loose making it look like PSI issues. Again, just a guess, but if your only getting 2850 with the same load, it's telling me the Remington has a larger chamber than your Winchester (great news for the Winchester).

I don't wholly believe in fast or slow barrels. I think if you could slug them both and see one is different than another then maybe that would explain it some. Wouldn't take much size difference in the bores to change them. It is an interesting topic for sure though. Just goes to show how different two same chambered rifles can act. Very cool. Thanks for posting this.

Yes...you're right...its mostly in the chambers...from the 3 examples I have or have had, FN chambers the model 70's just like they do their SPR rifles...which is, very tightly (+.001" headspace).

I fought with several Remington rifles over the years due to low velocity and premature pressure signs...knowing the whole time that it was very unlikely that there was any real pressure issue...but without pressure testing equipment, all I could do was go by what I could see and feel (bolt lift).

 

[Ridgerunner665]

Also...on the Remington, in reference to the firing pin hole and cratered primers...thats the one sign it didn't show...the primers are flat, but not cratered...there is a visible ejector mark though...I'll see if I can get pics.

 

[SJB358]

Sounds good RR. It's always a fun challenge to sort that sorta thing out.

 

[DrMike]

Very handsome rifle, RR. I do love the Featherweight's look. It just appeals to me.

 

[ScreaminEagle]

Nice looking rifle RR.

 

[Ridgerunner665]

2nd row is from the Winchester...the 4 pieces of brass.

The front row in the pic are all from the Remington, all the same load...the ejector marks are hard to get a good picture of, but they are there on every single piece of that brass, I placed the ejector marks all at the 12 o'clock position for the pic...see how much flatter the primer are...some are factory loads, some are reloads...the silver primers are reloads.

 

[DrMike]

I'll venture that you are seeing bolt thrust due to variation in chamber dimension.

 

[Ridgerunner665]

I'll venture that you are seeing bolt thrust due to variation in chamber dimension.

I agree...

 

[Guybo]

And the exact size of the bore would be interesting to compare. Sounds like the new gun is doing well.....

The wife's new rifle is finally all put together...gonna shoot for groups tomorrow.

Nice looking rifle!, love the wood stock.

 

[6mm Remington]

We had 4 Remington Model 700's with the heavy barrel in .308 and 1 Savage' heavy barrel also in .308. The barrel length ranged from 22" the shortest, the rest 24", and one that was 26". We shot the same lot of .308 with 168 gr. Sierra HSM ammunition. It's been a long time since we did this so I'll try to remember as best as I can.

1. Between the fastest and the lowest chronographed velocity in the rifles was right about 200 fps. (That really surprised me!)

2. The shortest barrel was not the slowest over the chronograph.

3. The longest barreled rifle was not the fastest either!

It's amazing what different bore dimensions, bore condition, and chamber dimensions can do. I guess that's why they tell us to start low and work up.

 

[Ridgerunner665]

It would be interesting to measure case capacity from the two chambers.

Rem 700 = 70.7 grains
Win 70 = 70.5 grains

Used brass from each rifle that had the same dry/empty weight...

When I put 70.5 grain in QL for the case capacity...the projection isn't even close....I measured the bullets, seating depth, shank depth, etc...and edited those values also...why does QL say 2,850 fps is all it will do with 54 grains of H4350?

What am I missing?

 

[SJB358]

That's truly odd. I'd have to slug the bore. That's really about the only thing left.

 

[Ridgerunner665]

That's truly odd. I'd have to slug the bore. That's really about the only thing left.

I no longer own the Remington...lol...sold it back to the previous owner.