28 Nosler throat erosion 😳😳

[crashlanding]

160 is a very cool burning powder, very close to H1000. AA2700 is one of the coolest burning powders and it is in the burning rate of IMR 4350 approximately.

That's some good information, I've often wondered but could not get good clarification of the two. Thanks

 

[Carey Farmer]

From Vihtavuori's website:

Energy content (J/g)

N500 High Energy Rifle Powders | Reloading | Handloading | Gun powder - Vihtavuori

Vihtavuori N500 high energy rifle powders are the perfect reloading option for a shooter who is looking for added velocity and range with heavy bullets.

www.vihtavuori.com

N530	N540	N550	N555	N560	N565	N568	N570
3950	4000	3900	3700	4000	4000	3850	4000

N100 Smokeless Powders | Reloading | Handloading | Single base Rifle powder - Vihtavuori

The Vihtavuori N100 powders are rifle powders with different burning rates to optimize your rifle loads. N100 powders are well-known in eg. benchrest.

www.vihtavuori.com

N110	N120	N130	N133	N135	N140	N150	N160	N165	N170	24N41	20N29
3950	3700	3750	3600	3550	3700	3750	3650	3500	3700	3700	3600

 

[VinceMule]

I shot the throat out of a 220 Swift real quick with N550, went to AA2700 and it has been happy days, 50g at 4000 shooting bug holes with Rem cases and 9 1/2 till the barrel was shot out. Then went to the 22/250 AI with AA2700 with the 55's at 4050 fps.

 

[DakotaFire101]

Well shoot! It looks like you've got the throat to run the 177 hammer hunter now!

 

[JuddL]

When I was shooting mid range benchrest my mentor told me once…shoot what shoots well and don't worry about barrel life, there are companies out there making barrels while we sleep at nite.

 

[Mike Matteson]

And everybody complain about 220 swifts.

 

[cabelasken]

I read that the 26 and 28 Nosler barrel life was 500 to 700 rounds ?? Is this correct.

We found stainless barrels may last slightly longer, but it really depends on the powder and how much of it you are stuffing into the case and the bearing surface and design of the bullet you are using. I've found that my medium capacity cases, under 60 grains can hold accuracy to 4000 to 4500 rounds, but when you get above 70 grains capacity, accuracy drops off at 3000 to 3500 rounds and above 80 grains capacity 2000 to 2500 rounds. That is because you are pushing more unburned kernals thru the barrel which acts as an abrasive. Some powder are much harder than other and this adds to the damage. Proper cleaning is important too.

 

[BillLarson]

This is from my dads rifle. I've loaded for it since the very beginning. It's been shooting 155 Hammer Hunters with 84gr. of N570 for about 200 rounds. When the gun was brand new I checked the jam on the bullet (case on the left). I've been chasing a steep velocity drop lately, so I decided to recheck it by jamming another bullet. .236" of throat erosion in right around 200-250 rounds .

View attachment 437693

WOW...... that's worse than a 6.5-284 or a 7mm mag......
PERFORMANCE COSTS $$$$$$$$$

 

[BillLarson]

And everybody complain about 220 swifts.

I've got less outa a swift .......
... I've had a good 6.5x284 cut rifled barrel go on me at 400 rnds. during a match.....

 

[VinceMule]

More should be paying attention to the Heat Index Chart, it is shocking first time you see it.

 

[Mike Matteson]

I use 55gr Sierra SPBT @ 3900 fps. It was my understanding a long time ago that holding down the velocity under 4000fps was a lot easier on the barrel.

 

[VinceMule]

I shoot the accuracy node.

 

[JakeM300winnie]

Anyone know the heat index on R26. Is there a chart somewhere that shows all powders?

 

[crashlanding]