for the rear i've had a 3D ELR bag (for a semi-auto platform) the longest and the most time with it.
starting out as a block with different (L+H+W) dimensions makes it flexible for setting up a stable base of various heights.
if i pack the stock into the dense filling of the elr and bottom it out, i don't have to mess with it over a 10-shot string.
i would recommend the product and company (Precision Underground), for whatever that's worth.
it's not like i'm frank or something.
although i love the elr for the range, it is relatively heavy and maybe not so ideal for field use where long strings of fire are not needed (hopefully).
for something more pack friendly, more flexible for using as a front bag, and with the handle that make it easy for me use it more like a "squeeze" bag in the rear to get off a quick shot or two, i like the pint sized game changer (sticky). it is light, has a cool sticky surface that i can throw on a fence or rail and not worry about it slipping off. it also helps keep the bag from sliding when you're using it as a rear bag on pretty much any kind of surface you're likely to run into. don't be fooled by the ears on the pint sized sticky. the light loose filling adds to the flexibility, as it is also an X bag or a high wedge when you're using it for a rear bag.
after having tried both of these bags now, if i had to choose one i would say both.
while the game changer is awesome, the elr is still more stable laterally due to the denser filling.
honestly, from one of the hated "poors" on the forums, i think it is worth having both, but would choose the ELR if i only used it at the range for prone and bench shooting and wanted to shoot long strings of fire on target at a rapid clip. as a newb and a poor, i think it might be a little more forgiving if your setup isn't perfect, but again this is jmo and i am a nobody.
if i could only have one bag and i needed to be operator af and run around with all my shit like a young whippersnapper, taking out targets and moving quickly to find more, (or i shot that sort of competition) i would take the sticky pint sized game changer or one of it's larger brothers all day.
i also recommend this product and company, and they sent me an unsolicited refund on shipping, so their customer service seems top notch.
if you have to shoot off a smooth surface at the range and your bag (whatever you have if it isn't a sticky) slips and slides, my "poors pro tip" is to steal a silicone baking mat from your wife. you can see what i am talking about in the picture below. i found this to work on even the slickest surfaces, like the butcher board top of my workbench. the one in my range gear is a cut down version of that mat so it is only as big as it needs to be.
if you don't want to look like a dork, or your wife doesn't bake, you can use any rubber mat, or if you don't want to bother with the stupid mat idea, spray good thick coat of plastidip or flexseal on a few of the sides of whatever bag you have (another poors tip that costs less than 10 bucks). if it gets jacked up scrub it down and spray it again. it somebody points out how fucked up it looks, tell them you're operator af and they should stfu.
Three dimensions of stability.
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