.270 win help. Cratering primers update Page 8 post 78

[Mudpuppy]

I’ve decided that the best load is the 55.5 gr load. I still need to load up 20 rounds to head back out and confirm that the rifle is performing properly with them but it appears the end issue was the monolithic bullets.

Bought a copy of Ken Waters Pet Loads years ago and in it a suggested Jack O'Connor load was 56gr of IMR 4831, which is exactly what my load development worked out to be 12 years before I bought the book. Thought that was pretty cool, seems he might have known something about the 270!!

I have reloaded for several friends 270's over the years and every one of them has been quite happy with the same loading.

Been a lot of email’s range trips and components for what should have been a simple load development to find this end result. But it did remind me of another rifle. My dad has a t3 in 338 and I had issues with his and running Barnes bullets. I switched to the partitions and it went away. Funny that’s been two rifles that didn’t like Barnes bullets.

My Winchester Model 70 in .270 absolutely hates monolithic bullets, went through bullet-powder-primer-case and seating depth changes and never could get it to shoot them properly, groups all over the place and velocities no where near what they should have been. Put some Nosler Partitions or Ballistic Tips down the barrel and it sings.
My 7mm Rem Mag on the other hand loves Barnes, so it really can be hit or miss with them.

 

[just having some fun]

Some times barrel twist on one barrel vs another barrel plays a big part in how accurate it is

 

[emerson]

I found monos required me to drop my load over 2 grains in my ‘06 to maintain the same velocity.

 

[bobjoe]

Bought a copy of Ken Waters Pet Loads years ago and in it a suggested Jack O'Connor load was 56gr of IMR 4831, which is exactly what my load development worked out to be 12 years before I bought the book. Thought that was pretty cool, seems he might have known something about the 270!!

I have reloaded for several friends 270's over the years and every one of them has been quite happy with the same loading.


My Winchester Model 70 in .270 absolutely hates monolithic bullets, went through bullet-powder-primer-case and seating depth changes and never could get it to shoot them properly, groups all over the place and velocities no where near what they should have been. Put some Nosler Partitions or Ballistic Tips down the barrel and it sings.
My 7mm Rem Mag on the other hand loves Barnes, so it really can be hit or miss with them.

I’ve used Ken waters book that I got for Christmas or my birthday for years. His data is normally spot on for the vast majority of the loads I’ve used. It is interesting that some guns just don’t link mono bullets. My dads 338 never had any bad pressure signs, just never shot them decent.

 

[bobjoe]

I found monos required me to drop my load over 2 grains in my ‘06 to maintain the same velocity.

In my 338 WM I had to drop 4grs of RL19 and actually increased velocity about 50 fps doing so switching to Barnes bullets.