Anyone have chrony numbers for the Remington Core-Lokt 45-70 405gr SP?

The ROC

The ROC

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I was at the range today shooting over a chrony with my 45-70 reloads and finally decided to fire off my last three factory rounds of Remington Core-Lokt 45-70 405gr SP and I was very surprised by the numbers I got for these factory rounds. Out of my Henry 45-70 with a 18.5" barrel they chronied at 900 fps average. That is a far cry from the advertised 1330 fps.

Anyone have some numbers?
 
Thanks.

My Chrony is calibrated correctly so most likely a quality control issue on that batch. OR based on approximately 50 fps per inch (online research) the numbers are correct if 1330 fps is based on a 24" barrel.

I was wondering why shooting these rounds felt like shooting a 22LR.

It's why I reload...
 
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Out of a Marlin Guide guide I was seeing (1038, 1057, 1033, 1041). With the Rem 405.

The 300gr loads weren't much better. I think they are supposed to be around 1800fps, I was averaging 1500fps
 
My Rem 405 factory loads measured 1180FPS from a standard barrel ( 22") 1895 Marlin. Expect a bit less from your shorter barrel (but not 50fps / inch less). Unlike small bore bottle neck cartridges, the 45-70 does not lose as much from shorter barrels compared to standard length because of the greater expansion/bore ratio.
 
My cousin recorded around 1200 fps from his Marlin Guide Gun.

I'm wondering now if it was just a quality control issue with this lot. As I mentioned earlier shooting this box of Rem 405 felt like shooting 22LR.

Anyway, I'm reloading so now with hard cast.
 
I just shopped at Wholesale sports in Saskatoon and noticed that they had two different loadings of Remington 405 grain 45-70 in stock. One was "safe for all firearms" and one was "for modern firearms only" It took quite a lot of searching but the higher pressure stuff is listed at 1580 fps - a BIG difference in power and recoil etc. So i bought a box of the higher power factory stuff to compare with my hand loads, should be interesting.
 
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