480 ruger and imr sr 4759 load data

[soulrebel0831]

First time poster long time reader. I have 3lbs of sr 4759. Burn rate looks perfect for 480 ruger. Does anyone have load data for this cartridge with 405 gr wfngc or 340 gr coated?
I also have 5744. I saw accurate has data for reduced loads for 475 linebaugh. Just wondering if I could get a starting point with these bullets.

Thank you in advance

[gnappi]

First off, welcome, if there is one place you can hope to find data, this is it.

Unfortunately, the available 480 data I have found is skinny to be sure, and everything I have is for 4227, 110, AA 5,7, and 9.

I'm going to follow this thread closely because I'm collecting any 480 load data I can find.

[soulrebel0831]

Yesterday I went out and shot my 480 for the first time. I shot aa no 9 with Matt’s 405 gr wfn. I started at 18 gr and loaded to 20. My 480 definitely doesn’t follow load data. With 18 gr of no 9 my chronograph read avg 1200 fps and with 19.0 gr I got 1275 fps which is hotter than expected or wanted.

[bula]

Halloooo ! John Taffin, this is your que.. OK, there are several guys here with deep enough knowledge to put you on the right track. I recall an article by, wanna say McPhearson ? On this idea but not in 480, yrs ago. Think I recall John Taffin on this subject too ? Please wait for other opinions, but think this is a fill to base of bullet thing ?

[blackmamba]

The problem with 4759 is that it is so bulky you can't get enough in the case to have a clean burn. A 105% case fill under a 400 gr bullet only gives about 14 kpsi and partially burnt and completely unburnt kernals of powder come out all over the place and can even tie up the gun. 4759 was designed for cast bullet shooting in rifles at lower pressures (for rifles) but still in the 25-30 kpsi range.

[soulrebel0831]

Ok thank you. I’ll leave it for the 45-70 then. Any thoughts on that aa no 9 and my start load and chronograph velocities?

[soulrebel0831]

I also shot 340 gr Missouri bullets yesterday with unique. My most accurate load was with 10.5 gr at 1080 fps.

[bula]

With a CCI350 primer and 8.2grs of Trail Boss, my figuring to be snug to base of bullet, goes 750-ish from either BSBH, 480.. Your 10.5grs of Unique, seems spot on for velo, per my findings. 

[soulrebel0831]

Anyone shooting a 400-405 with no 9? That care to share some data and velocity.

[soulrebel0831]

I loaded 475 linebaugh cases that were trimmed with no 9. I used benchrest cci rifle primers because I have excess and the linebaugh uses lrp. My initial ladder was 18.0 gr to 20.0 gr.
I used Matt’s 405 gr wfn gc with hornady brass.
1.635” col
18.0 gr avg velocity 1210 fps
18.5 avg velocity 1225 fps
19.0 avg velocity 1260 fps

Loads were shot from 7.5” srh

What charges and col do y’all use with no 9?
Or am I barking up the wrong tree with powder choice?

I am looking for my carry load while deer hunting this November on kodiak. I feel like everyone else likes the 1100 fps loads.

[bigbore5]

Velocity is pressure. If the load data you have is for the same bullet, same COL, same barrel length, etc. then your velocity should be close to the same. If your load at 18grs gives the same velocity as 19grs with the only difference being the load, then the pressure will be very close to the same.

Have you tried large pistol primers in your gun? Starline brass is cut for large rifle primers, but most guns will function fine with Large Pistol Primers. Non-magnum primers light #9 just fine.

My #9 loads are for the Linebaugh in the BFR. I don't own a 480 yet, so I can't help there.

[soulrebel0831]

I haven’t tried large pistol yet with the linebaugh trimmed cases. I haven’t done magnum primers for no 9

[bigbore5]

Most large rifle primers are actually hotter than Magnum Large Pistol. They are intended for long columns of slow rifle powders.

Using them in short pistol cases with faster powders causes funny things to happen. I do use large rifle primers (standard, never magnum) in some of my dangerous game loads, but they were developed specifically for those primers using harder to light powder like H110 and 300MP.

[ridenshoot]

Chrono results of 480 Ruger SBH.
475L brass cut to 480 Ruger.
Lee bullet cast of wheel weights, 395 grs, crimped in closest groove to nose.
I used Federal Large Pistol primers (non-magnum), inserted w/ Lee hand priming tool.
9.5 gr Unique










This was a test load to workout the cut down 475L cases, thus only 4 rounds.
The 4 shots are the ones without Sharpie marks, the upper left is two shots.
Shots were offhand at approx. 10 yds, the lower left is me jerking the trigger.

Hope this isn't too off topic, just wanted to show the use of large pistol primer
in the 475L brass.

Please note that the screen shot of the chrono results indicate a bullet weight of 365, however I was typing on my phone, in the sun, at the range, without my
prescription glasses.  The actual weight of the bullets, sized and lubed is 395 grs. weighed on my Lyman digital scale.