Several years ago my uncle had a old Vietnam Sniper vet friend (he moved. I was only 14 or 15 and learned a lot on how to shoot but didn't pay any attention to reloading (stupid me). My dad has a rem 700 7mm mag classic. My uncle has a rem 700 sendero 7mm mag. My uncle jacked 50 of my dads reloads and they wouldn't work in his gun I think they were to long. Why is this? I just bought a Dillon 550 to reload and am going to load for 7 different ar-15 a dpms 308 and the same 2 7mm mags can you guys help me thanks.
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Reload fits in one gun but not the other.
- Thread starter SPRINKLE
- Start date
Re: Reload fits in one gun but not the other.
Magnum cases need to be full length resized if going to another gun. You can get a collet bullet puller, pull them, download the powder, FL size them replace and most likely be ready to go.
Magnum cases need to be full length resized if going to another gun. You can get a collet bullet puller, pull them, download the powder, FL size them replace and most likely be ready to go.
Re: Reload fits in one gun but not the other.
Whenever you reload you should use a RCBS precision mic or Stoney Point set to measure headspace and measurement for where bullet will engage the rifling. I have had rifles that went from "0"- "+7". If you bump the shoulder back on the +7 chamber .002 , you will still be .005 longer than the "0" chamber. Some rifles have alot of freebore, so it would be possible to have reloads jammed into rifling if switched between rifles. If they don't chamber - pull down ammo, resize correctly, dump powder and work up a good safe load.
david
Whenever you reload you should use a RCBS precision mic or Stoney Point set to measure headspace and measurement for where bullet will engage the rifling. I have had rifles that went from "0"- "+7". If you bump the shoulder back on the +7 chamber .002 , you will still be .005 longer than the "0" chamber. Some rifles have alot of freebore, so it would be possible to have reloads jammed into rifling if switched between rifles. If they don't chamber - pull down ammo, resize correctly, dump powder and work up a good safe load.
david
Re: Reload fits in one gun but not the other.
their are no two chambers alike.thats why you keep brass separated or labeled for that rifel.and if it was me I would ask for some of his brass and load him some.buy the time you pull down the loads and resize the brass you could have loaded 3-4 rounds.but this is just an opinion.
their are no two chambers alike.thats why you keep brass separated or labeled for that rifel.and if it was me I would ask for some of his brass and load him some.buy the time you pull down the loads and resize the brass you could have loaded 3-4 rounds.but this is just an opinion.
Re: Reload fits in one gun but not the other.
Like Al said, it's all about headspace. (so i wouldnt suggest loading to the shorter length and substituting, could be veeeery bad)
Like Al said, it's all about headspace. (so i wouldnt suggest loading to the shorter length and substituting, could be veeeery bad)
Re: Reload fits in one gun but not the other.
I was in a hurry having to leave to go to town on the first response. Now I will finish. Magnums have a rather unique condition, they headspace on the belt not the shoulder. Magnums have a TREMENDOUS shoulder location variation chamber to chamber and can be found in manufactured ammo as well. For instance the distance from base to mid shoulder on 7 Mag can be .007" and the variation of bolt face to shoulder in the chambers can be .015".
This is why L.E. Wilson headspace gages are "adjustable" as they have to be set for a specific rifle. They can't just have one gage fits all.
What to do:
1. Measure the OAL of the loaded rounds and check that against a loading book. If too long, run in seat die and set back to recommended OAL. The SAAMI standards call for a min OAL of 3.185" and a max of 3.290" on factory ammo. Adjust to the longest OAL length first and give them a try. If you see land marks on bullets you have previously tried the OAL is too long so start setting them deeper about .010" at a time till you get no more land marks. If you get to MIN OAL stop there, you may have a sizing problem.
2. As previously indicated pull about five bullets, offload the propellant into other cases so you won't have to weigh it again and set up a size die to where your die touches the shell holder.
Lube up a case and run it in.
3. When the ram gets to the top of the travel stop and look and see if the shell holder is still touching the die. If not the reloading tool is springing so you can back off and just barely turn the die in a very sight amount and run the case back in. Keep this up till the shell holder touches the die. Adjusted in this manner if the dies are chambered correctly this case should fit in ANY 7MM Mag.
There CAN BE another problem a friend had about ten months ago. He has a Howa 300 Win mag that would chamber and fire factory ammo just fine but when he FL sized them they would not go back in same rifle. He bought another set of dies and tried again. Nothing and bought a third set and still nothing.
He related all this to me at a fire dept meeting and I told him to bring it down and we ran cases in my dies which I know are right and still they would not go.
I knew then there was a chamber problem so we screwed the barrel off, set the shoulder forward one thread, cut same off bottom of barrel and ran my 300 Win Mag MIN DIMENSION match reamer in. I knew something was wrong when the reamer started cutting in the middle of the body and not the shoulder. I headspaced his rifle to snug on a GO gage and screwed it back on and every last round he had previously loaded in three sets of dies closed easily as well as new factory ammo.
So now he has a new chamber cut min dimension and all ammo will chamber just fine.
I was in a hurry having to leave to go to town on the first response. Now I will finish. Magnums have a rather unique condition, they headspace on the belt not the shoulder. Magnums have a TREMENDOUS shoulder location variation chamber to chamber and can be found in manufactured ammo as well. For instance the distance from base to mid shoulder on 7 Mag can be .007" and the variation of bolt face to shoulder in the chambers can be .015".
This is why L.E. Wilson headspace gages are "adjustable" as they have to be set for a specific rifle. They can't just have one gage fits all.
What to do:
1. Measure the OAL of the loaded rounds and check that against a loading book. If too long, run in seat die and set back to recommended OAL. The SAAMI standards call for a min OAL of 3.185" and a max of 3.290" on factory ammo. Adjust to the longest OAL length first and give them a try. If you see land marks on bullets you have previously tried the OAL is too long so start setting them deeper about .010" at a time till you get no more land marks. If you get to MIN OAL stop there, you may have a sizing problem.
2. As previously indicated pull about five bullets, offload the propellant into other cases so you won't have to weigh it again and set up a size die to where your die touches the shell holder.
Lube up a case and run it in.
3. When the ram gets to the top of the travel stop and look and see if the shell holder is still touching the die. If not the reloading tool is springing so you can back off and just barely turn the die in a very sight amount and run the case back in. Keep this up till the shell holder touches the die. Adjusted in this manner if the dies are chambered correctly this case should fit in ANY 7MM Mag.
There CAN BE another problem a friend had about ten months ago. He has a Howa 300 Win mag that would chamber and fire factory ammo just fine but when he FL sized them they would not go back in same rifle. He bought another set of dies and tried again. Nothing and bought a third set and still nothing.
He related all this to me at a fire dept meeting and I told him to bring it down and we ran cases in my dies which I know are right and still they would not go.
I knew then there was a chamber problem so we screwed the barrel off, set the shoulder forward one thread, cut same off bottom of barrel and ran my 300 Win Mag MIN DIMENSION match reamer in. I knew something was wrong when the reamer started cutting in the middle of the body and not the shoulder. I headspaced his rifle to snug on a GO gage and screwed it back on and every last round he had previously loaded in three sets of dies closed easily as well as new factory ammo.
So now he has a new chamber cut min dimension and all ammo will chamber just fine.
