IMR 4007ssc in 220 swift

T

travjc

New member
Wondering if anyone could give me thier input on using IMR 4007SSC in a 220 swift. Have been using IMR 4064 with good results, just need to load up more shells and thought about giving it a try. Will be pushing 55gr V-max. Also have 50gr V-max on the shelf to play with if someone suggests it.
 
Been looking at that, noticing a fair difference between thier max load and that of hornady's max. Tring to figure a good starting point. As is, I'm already 2.2gr over hornady's max with 4064 and just starting to see flattening of primers (WLR). 38.6gr of 4064 has been the load for me behind a 55gr sp. Going to try the V-max out in it for a little better bc.
 
I've played with a Swift, a while. IMR-4831 is my go to powder with the 55's. Being the speed freak I am, I'm always looking for something better. I have burned a lot of IMR-4064 as well, with the 40-50 grain bullets.
 
4007ssc can be magic in the Swift. It works well for me.

For internet speak, start at 39.0gr with the 55gr. I am well beyond that with about 4025fps with the 55gr pill. Some have claimed 4100+fps with this powder and 55gr pills. Have fun! It is a great powder.
 
Originally Posted By: Smokeless4007ssc can be magic in the Swift. It works well for me.

For internet speak, start at 39.0gr with the 55gr. I am well beyond that with about 4025fps with the 55gr pill. Some have claimed 4100+fps with this powder and 55gr pills. Have fun! It is a great powder.
I understand! I was going to start just a little higher than 39gr. I saw Catshooters' claim of 4100+fps, yowzee! Smokin!
 
Ya, I'm not really "that" concerned with the speed, just figure I can take something that works great and make it better. I'm using Winchester brass and primers. Any thoughts to sparking it off using magnum primers? Suppose I should use a better word than claim, rather CatShooter's statement about 4100+fps.
 
CatShooter's "claim" is just that. I have not seen it, or duplicated it, but I believe him.


As for spark, when you get up into the higher pressure loads, use magnum primers. They hold the pressure better.
 
Way too many variables to say what can and can't be done. I had read a little about using magnums for that, but most theory was due to the hotter igition lending to more consistent velocity. Also, there is the cup hardness, and I could go to CCI's if need be, but I have several K's of Win primers. Kinda think though that if I'm flattening Win's that's probably hot enough for me.
 
How are those Winchester 220 Swift brass working for you?

Reason I ask is, I just went through a batch that I had to anneal before I could load them. The neck tension was so great that when I tried to pull a bullet after it was loaded in the case, I actually pulled the lead core out of the jacket. The jacket base is still in that damm case!

Once annealed, they were fine.
 
Have had no problem with the 200 I have been using for several years, but I have 400 new in the bag on the shelf I haven't needed yet. I don't shoot it frequently, but when I do it isn't uncommon for me to shoot 60-100. That's part of why, as Sunday went out and did a little p-dogging and shot up the last of what I had loaded. Already loaded up 100 with the old recipie, but used up the last of my 55gr sp's. Thought it might be time for something new. Part of my routine with new brass is to trim all to same length that way I can monitor stretch. Fifth loading for this batch and only .005" longer than after first firing.
What dies are you using? I Have a set of RCBS dies that I bought about 19 years ago. They are FL but I have the sizer backed off enough to barely bump the shoulder. Just enough to feel a little resistance on the bolt.
 
Dies I have are RCBS, and CH, with a Redding body die.

Yes I size before I load new brass.

BTW, magnum primers don't burn with a hotter flame, but rather a longer flame, plus there cup is thicker. Up here it gets cold, and the longer flame lights off better at below 0 F.
 
K, well there has been some discussion lately about sizing new brass or not and didn't know which side of the fence you were on. I'm with you.
I'll keep the cup thickness in mind, cold temps aren't going to be an issue for this situation, but I have gone to mag primers in all of my hunting loads just because.
I'll see how this new brass acts, bought it off a guy on here, so don't know the age other than new.
As a curiosity have you compared neck thickness on your new brass with other?
 
I don't know if that would cause a problem or not. Haven't ever gotten into being overly anal about neck thickess and neck tension. Something I likely should do on the swift, but not worried about benchrest accuracy, more minute of prarie dog accuracy.
Uniformity, key word to accuracy I believe. Try to eliminate as many variables as possible.
 
Originally Posted By: SmokelessCatShooter's "claim" is just that. I have not seen it, or duplicated it, but I believe him.


As for spark, when you get up into the higher pressure loads, use magnum primers. They hold the pressure better.

Keep in mind that my .220 Swift is a Remington 40-XB/SS with a 28" tube and a long throat. Loaded COL is 2.950".

If you try to get 4,100 fps with a 24" barrel and a COL of 2.80", you are going to have to pull the trigger a damm lot harder than I do.
 
If i can keep it at or near that 3900fps I think it will still group as it does now. Just curious what it will do with the 4007ssc. If I get a little more speed, great. If not, I'll just keep using the 4064.
 
Now just wishing for a nice calm day off from work. The three of those don't happen but once in a blue moon. Have 30 rounds loaded up to do some ladder testing and group testing. Will be interesting to see what the velocities do.
 


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